we know that this is a person who they believe was involved in the attack, who left libya, went to turkey, and then was detained by turkish officials and transferred to tunisia. and the u.s. is negotiating, going through the process of negotiating, getting access to this person. they want to pinpoint as many of those attackers as they can. >> how did they track this individual? especially since we know, from statements from the white house, and the confusion we've all talked about over the past few weeks, how were they able to zero in on this particular suspect? >> i don't know, exactly, is the fair answer. but this person apparently was posting details about the attack as it was happening on social websites. fg you think about now how much intelligence information is joined fri open sources, from the media, from cnn, facebook, twitter, that kind of thing, there's a lot of stuff out there. and to think of the audacity, though, someone, as an attack is going, put details about it on their so social website, you've got to wonder if they're thinking about getting caught. >> i really wonder.